Token Ring Alarms

Token Errors

The threshold of errors requiring the management

 

station (while acting as the active monitor) to transmit a

 

token onto the monitored ring before it issues an alarm.

 

The default value is 10.

Claim Token

The number of times that a claim token can be released

 

by ring stations within the given time base before an

 

alarm is triggered. A claim token is released by a ring

 

station when it detects that the active monitor is absent

 

or malfunctioning. Stations receiving the claim token will

 

participate in the monitor contention process to

 

determine a new active monitor. The default value is 5.

Lost Frame

The number of lost frames that the management station

 

transmits onto the monitored ring before triggering an

 

alarm. Lost frames are frames that do not return before

 

the management station’s Timer Return to Repeat (TRR)

 

timer expires. These can be caused by stations entering or

 

leaving the ring during frame transmission. The default

 

value is 10.

Frame Count

The number of frames that can be transmitted on the ring

 

within the time base before the alarm limit is reached.

 

For a network running at 16 Mbits/sec, the default value

 

is 33,890. This number represents the maximum

 

bandwidth used by 64 byte frames transmitted over the

 

network during the default 10 second alarm time base.

 

For a network running at 4 Mbits/sec, the default value

 

is 18,920 (of 64 byte frames).

Beacon

The number of beacons that can be detected on the ring

 

within the time base before the alarm limit is reached. A

 

station transmits a beacon when its monitor contention

 

timer expires, indicating that an Active Monitor could

 

not be elected. Beaconing provides a method for the

 

beaconing station and its NAUN to check their lobe

 

wiring and to begin the monitor contention process if

 

necessary. The default value is 1.

Ring-Level Station Alarms

When you set a ring-level station alarm (using the fields in the section of the window labeled Station Errors), the alarm threshold will be applied to all stations inserted into the currently monitored ring network. These values will override any pre-set station-level alarms, so these fields can be used to quickly apply one set of station-level alarm limits to all stations on the ring.

Ring-Level Alarm Limits

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Enterasys Networks MicroMMAC-T manual Ring-Level Station Alarms, Token Errors